Evaluation of the maladaptation of the test base in acrylic resin regarding the technique of preparation, place of measurement and storage time

Abstract Introduction The most used material for the preparation of the baseplates is the acrylic resin, but it can present distortions. Objective To evaluate preparation technique, region and storage time that presents less maladaptation of the base when made with self-cured acrylic resin. Material and method Models were created in gypsum type III simulating edentulous maxilla, as divided into 3 groups (n = 10): GC (control group) thermopolymerizable acrylic resin; G1 - manual adaptation technique and G2 - drip technique. For the measurements, silicone by condensation of light consistency that was interposed between base and model was used. With a hydraulic press, 50 kg pressure was applied leading the base of the model. The obtained mold was measured in the palate, canine and molar regions with a digital caliper at the following times: immediately after the base polymerization, at 24, 48, 72, 96 hours and one week. The results were submitted to statistical analysis. Result G1 presented maladaptation of 0.43 mm ± 0.10, while G2 obtained 0.39 mm ± 0.11. The lowest maladaptation occurred in the CG. The palate region presented greater maladaptation (0.52 ± 0.07) and the canine region, the lowest (CD = 0.27 mm ± 0.07 and CE = 0.27 ± 0.09); There was no statistically significant difference for storage times. Conclusion G2 presented lower values than G1, with no statistically significant difference. The palate region presented greater maladaptation, followed by molars and canines. The bases continued to maladaptation the model after the immediate polymerization, with no statistically significant difference.

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Tensile strength evaluation of acrylic after ozonated water and microwave disinfection.

Journal Of Oral Research ◽

10.17126/joralres.2020.038 ◽

2020 ◽

Vol 9 (3) ◽

pp. 212-219

Author(s):

Hawraa Khalid Aziz ◽

Keyword(s):

Tensile Strength ◽

Storage Time ◽

Acrylic Resin ◽

Control Group ◽

Distilled Water ◽

Denture Base ◽

Significant Difference ◽

Ozone Disinfection ◽

And Storage ◽

Ozonated Water

Background: There is a need for safe disinfection methods without a detrimental effect on the acrylic denture base. Aim: the purpose of the current study was to evaluate the effect of ozonated water and two protocols of microwave disinfection on tensile bond strength of high-impact acrylic. Material and methods: Eighty samples were divided into four major groups: one control and three experimental groups, 20 specimens each. The experimental groups each received either disinfection by ozonated water, microwave 850W/1min, or microwave 650W/6min. Further division of the major groups into two sub-groups depending on the number of disinfection cycles and total immersion time in distilled water: One cycle and one day versus seven cycles and seven days. The control group specimens were immersed in distilled water without any disinfection for either one day or seven days. Tensile strength testing was performed on the specimens from the eight groups. The data were analyzed by SPSS version 21#. The ANOVA and Tukey-HSD multiple comparison tests were used for comparison for groups. Results: A non-significant difference in the tensile strength was observed in the groups subjected to one cycle of ozone or microwave disinfection at 850W/1min. There was a significant decrease in tensile strength for the specimens subjected to one cycle of 650W/6min microwaving. The number of testing cycles and storage time in distilled water had a significant impact on the tensile strength of the acrylic in all tested groups, by decreasing it. Conclusion: Ozone disinfection and microwaving at 850W for one minute did not affect the tensile strength of the acrylic, but repeated disinfection over seven days at one cycle per day impaired the tensile strength of the acrylic resin.

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Effect of Salt and Storage Temperature on Beef Sausage Quality

Progressive Agriculture ◽

10.3329/pa.v23i1-2.16561 ◽

2013 ◽

Vol 23 (1-2) ◽

pp. 15-24

Author(s):

R Luna ◽

MA Hashem ◽

MS Ali ◽

MM Hossain ◽

MAK Talukder ◽

...

Keyword(s):

Salt Concentration ◽

Dry Matter ◽

Storage Time ◽

Storage Temperature ◽

Concentration Level ◽

Control Group ◽

Fresh Sample ◽

Significant Difference ◽

And Storage

The experiment was conducted to find out the effect of salt and storage temperature on the quality of sausage. For this purpose sausage samples were divided into two portions. One is called fresh sausage and another is preserved sausage at different temperature. Then the fresh samples as well as the preserved samples were divided into four subdivisions, treated with different salt levels and e.g. control group-0% and the others are 1.5%, 3% and 5% of salt concentration. The preserved samples were stored at 4°C and -20°C. Samples preserved at 4°C were stored in the refrigerator for 21 days and were analyzed on 7th, 14th and 21th day and on the other hand samples preserved at -20°C were stored in the freezer for 60 days and were analyzed on 15th, 30th, 45th and 60th day. Dry matter and Ash content of all the samples increased with the advancement of storage time and salt concentration level. Dry matter in fresh sample was less compared to preserved samples. Crude protein (CP) percent of fresh samples were 23.13, 22.63, 22.48 and 22.44 at different salt concentration level. The values of CP, DM, Ash & Fat also varied among the samples significantly (P<0.01). Sausage can be preserved for 60 days in different techniques with different changes in the quality. Highly significant difference was observed in preserved samples than in fresh samples at different salt levels. Fresh sausage treated with 1.5% salt found to be more acceptable in terms of sensory evaluation.DOI: http://dx.doi.org/10.3329/pa.v23i1-2.16561Progress. Agric. 23(1 & 2): 15 24, 2012

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Linear dimensional stability of irreversible hydrocolloids with and without disinfection at different storage times

RSBO ◽

10.21726/rsbo.v15i2.673 ◽

2019 ◽

Vol 15 (2) ◽

pp. 77

Author(s):

Lidia Olga Bach Pinheiro ◽

Alfonso Sanchez Ayala ◽

Marcos Cezar Pomini ◽

Vanessa Taborda da Cruz ◽

Ingrid Viel del Farias ◽

...

Keyword(s):

Stainless Steel ◽

Dimensional Stability ◽

Storage Time ◽

Dental Practice ◽

Type Iv ◽

Significant Difference ◽

Irreversible Hydrocolloid ◽

Master Model ◽

Storage Times ◽

Digital Caliper

Irreversible hydrocolloids have been used in dental practice for decades and their pouring time has been suggested to be as short as possible; however the latest generation of alginates exhibit better properties, which could influence the fidelity of the casts. Objective: To evaluate the linear dimensional stability of stone casts obtained using two irreversible hydrocolloid brands (Cavex ColorChange and Jeltrate) after disinfection. Material and methods: Samples were divided into 16 groups (n = 10) according to brand, storage time and disinfection. Impressions were taken of a metallic master model made of stainless steel with two abutments. Cast models were obtained using type IV gypsum, after disinfection with sodium hypochlorite at 1% or without any disinfection followed by storage for four different times (immediate pouring, and after 24, 72 or 120 hours storage after obtaining the impressions) and the models were measured with a digital caliper. Data were submitted to ANOVA 3-way followed by Tukey’s test (α < 0.05). Results: A statistically significant difference was detected with Jeltrate Plus after 72 and 120 hours in storage (with and without disinfection), as well as Cavex without disinfection. Differences were found for Cavex with disinfection/24 hours storage, when compared to immediate pouring (P < 0.05). The alginates presented similar behavior regarding disinfection for the same time (P > 0.05). Conclusion: Storage longer than 24 hours affects the fidelity of casts. Disinfection does not promote significant alteration at any of the experimental times with either material.

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Linear dimensional stability of irreversible hydrocolloids with and without disinfection at different storage times

RSBO ◽

10.21726/rsbo.v15i2.617 ◽

2018 ◽

Vol 15 (2) ◽

pp. 77-83

Author(s):

Lidia Olga Bach Pinheiro ◽

Alfonso Sanchez Ayala ◽

Marcos Cezar Pomini ◽

Vanessa Taborda da Cruz ◽

Ingrid Viel del Farias ◽

...

Keyword(s):

Stainless Steel ◽

Dimensional Stability ◽

Storage Time ◽

Dental Practice ◽

Type Iv ◽

Significant Difference ◽

Irreversible Hydrocolloid ◽

Master Model ◽

Storage Times ◽

Digital Caliper

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IMMERSION OF HEAT POLYMERIZED ACRYLIC RESIN DENTAL BASE IN ARAK BALI AGAINST SURFACE ROUGHNESS

Interdental Jurnal Kedokteran Gigi (IJKG) ◽

10.46862/interdental.v17i1.2140 ◽

2021 ◽

Vol 17 (1) ◽

pp. 22-26

Author(s):

Kadek Ayu Wirayuni ◽

◽

I Made Hendri Dwi Saputra ◽

Keyword(s):

Surface Roughness ◽

Acrylic Resin ◽

Control Group ◽

Surface Strength ◽

Denture Base ◽

A Value ◽

Removable Denture ◽

Significant Difference ◽

Post Test ◽

Oral Tissue

Introduction: The denture base is the part of the removable denture that is supported by good adaptation to the underlying oral tissue. Most of the denture bases are made of acrylic or polymethyl methacrylate resin, better known as PMMA. However, the acrylic resin also has disadvantages such as easily broken and absorbs liquids both water and chemicals. The chemical absorption like alcohol, ethanol, and some drinks that contain acidic materials will chemically be induced with acrylic resin and settle in the pores of the acrylic resin. The chemical damage or defect creates roughness on the surface of the acrylic resin which can cause cracking or crazing and a decrease in surface strength and hardness. Materials and Methods: The method used in this research was a laboratory experimental design with a post-test-only control group using 12 samples consisting of 2 different types of samples by measuring the surface roughness of the acrylic resin after immersing the sample with a predetermined time. Results and Discussions: One-way ANOVA test results showed a significant difference in surface roughness after the samples immersion with a value of p = 0.006 (p <0.05). Conclusions: Based on this research, can be concluded that there is an increase in the surface roughness of the heated polymerized acrylic resin for 3 hours and 4 hours of immersion. The longer the heated polymerized acrylic resin is soaked in arak hence the level of surface roughness increases.

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Evaluation of color change in acrylic and bisacrylic resin resins in different solutions

Journal of Research in Dentistry ◽

10.19177/jrd.v5e4201776-84 ◽

2018 ◽

Vol 5 (4) ◽

pp. 76

Author(s):

Mone Laiz Bortoli ◽

Cristina Von Appen ◽

Camila Longoni ◽

Carmen Beatriz Borges Fortes ◽

Jefferson Tomio Sanada

Keyword(s):

Color Change ◽

Color Stability ◽

Acrylic Resin ◽

Color Variation ◽

Color Reading ◽

Control Group ◽

Color Changes ◽

Significant Difference ◽

Prosthesis Material ◽

Chlorhexidine Solution

Aim: This work aimed to evaluate the color stability of an acrylic resin chemically activated (ARCA) using different handling techniques, and a bisacrylic resin when exposed to different pigmentation solutions.Material and Methods: Silicon matrixes were confectioned (10x10x3mm) to be used as specimens. The groups were designed as follows: Group Pot, Group Brush, Group Manufacturer and Group Bisacrylic (n=18). Each group was exposed to three different pigmentation solutions: distilled water, coke and chlorhexidine digluconate 0.12%. Three readings were performed for each specimen using a spectrophotometer, and the evaluations were carried out in three different time. After the color reading, three averages and the standard deviation of variation were performed after 24 hours (T1), 7 days (T2) and 14 days (T3). Data were submitted to the ANOVA and 2 criteria and Tukey (P<0.05) in the statistical software SSPS 18 for Macintosh (SPSS Inc., Chicago, USA).Results: When compared the solutions in each group of material, there was no statistically significant difference, except for T3, where the group Dencor Brush and Bisacrylic demonstrated higher color variation in all the solutions, even in the control group, and the values in Chlorhexidine higher than the other, showing greater instability after 14 days.Conclusions: With the results, bisacrylic resin used as provisory prosthesis material presents greater color instability than the ARCA, when submitted to different solutions. Bisacrylic resin and Dencor Brush present significantly visible color changes in chlorhexidine solution after 14 days. All the materials in coke solution present homogeneity in the color change after 7 days exposition to the solution, with no visible color change.

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Karakteristik Fisikokimia dan Aktifitas Antioksidan Daging Itik yang Dilapisi Ekstrak Propolis Selama Penyimpanan Suhu Ruang

Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan ◽

10.29244/jipthp.9.3.151-157 ◽

2021 ◽

Vol 9 (3) ◽

pp. 151-157

Author(s):

A. Apriantini ◽

S. Adinata ◽

Y. C. Endrawati

Keyword(s):

Shelf Life ◽

Storage Time ◽

Ph Value ◽

Edible Coating ◽

Cooking Loss ◽

Propolis Extract ◽

Randomized Design ◽

Completely Randomized Design ◽

Storage Times ◽

And Storage

Duck meat is a perishable food that has a short shelf-life. Therefore, packaging is needed to be used tomaintain duck meat quality during storage, one of the ways to extend shelf-life of duck meat is usingpropolis extract as edible coating which is contained antioxidant substances which can be used to extendduring storage. The aim of this research was to analyze the effect of propolis extract as an edible coatingmaterial on duck meat to maintain the quality and extend shelf-life of duck meat at room temperature.The research was used a completely randomized design (CRD) factorial 4x3 with 3 replications,consisting of 4 propolis concentrations (0.0%, 0.5%, 1.0%, 1.5%) and 3 storage times (0 hours, 6 hoursand 24 hours). Duck meats coated with propolis extracts had a significant effect on the water content andantioxidant activity of duck meat (P < 0.05). The storage time had a significant effect on the pH valueand the cooking loss of duck meat (P <0.05). The addition of propolis extract and storage time had asignificant effect on the pH value, cooking loss and antioxidant activity of duck meat (P <0.05).

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Influence of Water Aging on Microtensile Bond Strength of a Flowable and a Packable Bulk-fill Resin Composites to Dentin

Open Access Macedonian Journal of Medical Sciences ◽

10.3889/oamjms.2020.3652 ◽

2020 ◽

Vol 8 (D) ◽

pp. 112-117

Author(s):

Ayah Atif Selim ◽

Ahmed Fawzy Abo Elezz ◽

Rehab Khalil Safy

Keyword(s):

Bond Strength ◽

Storage Time ◽

Resin Composite ◽

Water Storage ◽

Aging Effect ◽

Mean Value ◽

Control Group ◽

Microtensile Bond Strength ◽

Significant Difference ◽

Influence Of Water

AIM: Investigation of the aging effect on the microtensile bond strength (μTBS) of bulk-fill resin composite (RC) versus a conventionally incrementally applied one. MATERIALS AND METHODS: A total number of 45 sound human impacted third molars extracted molars have been selected to prepare specimens for the μTBS test. Teeth were randomly divided into three groups (C) according to type of RC material which used for restoring the teeth. Where nanohybrid RC (Grandio®SO) was used as the control Group (C1), packable bulk-fill RC (X-tra fil®) was used for restoring teeth in C2 group and flowable bulk-fill RC (X-tra base®) was used for restoring teeth in C3 group. Each group was further subdivided into 3 subgroups (n = 5) according to the water storage time, where in subgroup 1; teeth were stored for 24 h, subgroup 2; teeth were stored for 3 months while for subgroup 3; and teeth were stored for 6 months. After water storage, teeth were sectioned for preparation of μTBS testing beams. Maximum tensile stresses were recorded in megapascal (MPa). RESULTS: After 24 h of water storage, the X-tra base® showed a higher statistically significant μTBS to dentin (33.82 ± 9.84 MPa) than did the other two types of RCs. After 3 months, the X-tra fil® showed the lowest mean value of μTBS (10.90 ± 5.66 MPa), meanwhile, after 6 months of water storage Grandio®SO showed the highest mean value of μTBS (15.85 ± 6.76 MPa). Regardless of the time the X-tra fil® showed the lowest mean of μTBS (15.07 ± 11.73 MPa), while there is no significant difference between the X-tra base® and Grandio®SO. Furthermore, the water aging adversely affects μTBS values which deceased gradually by time. CONCLUSION: The packable bulk-fill RC characterized by lower μTBS to dentin in comparison to the flowable bulk fill and the incrementally applied nanohybrid RCs. Furthermore, the μTBS of the three tested materials decreased gradually by aging.

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Microtensile Bond Strength of Methacrylate and Silorane Resins to Enamel and Dentin

Brazilian Dental Journal ◽

10.1590/0103-6440201300009 ◽

2014 ◽

Vol 25 (4) ◽

pp. 327-331 ◽

Cited By ~ 5

Author(s):

Gisele Rodrigues da Silva ◽

Isabela Sousa Araújo ◽

Rodrigo Dantas Pereira ◽

Bruno de Castro Ferreira Barreto ◽

Célio Jesus do Prado ◽

...

Keyword(s):

Bond Strength ◽

Aging Time ◽

Storage Time ◽

Composite Resin ◽

Glass Plate ◽

Composite Resins ◽

Microtensile Bond Strength ◽

Bonding Interaction ◽

Significant Difference ◽

And Storage

The aim of this study was to evaluate the microtensile bond strength (µTBS) of two substrates (enamel and dentin) considering two study factors: type of composite resin [methacrylate-based (Filtek Supreme) or silorane-based (Filtek LS)] and aging time (24 h or 3 months). Twenty human molars were selected and divided into 2 groups (n=10) considering two dental substrates, enamel or dentin. The enamel and dentin of each tooth was divided into two halves separated by a glass plate. Each tooth was restored using both tested composite resins following the manufacturer's instructions. The samples were sectioned, producing 4 sticks for each composite resin. Half of them were tested after 24 h and half after 3 months. µTBS testing was carried out at 0.05 mm/s. Data were analyzed by three-way ANOVA and Tukey's HSD tests at α=0.05. Significant differences between composite resins and substrates were found (p<0.05), but no statistically significant difference was found for aging time and interactions among study factors. The methacrylate-based resin showed higher µTBS than the silorane-based resin. The µTBS for enamel was significantly higher than for dentin, irrespective of the composite resin and storage time. Three months of storage was not sufficient time to cause degradation of the bonding interaction of either of the composite resins to enamel and dentin.

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Fracture Resistance of Immature Incisors Following Root Filling with Various Bioactive Endodontic Cements Using an Experimental Bovine Tooth Model

European Journal of Dentistry ◽

10.1055/s-0039-1695654 ◽

2019 ◽

Vol 13 (02) ◽

pp. 156-160 ◽

Cited By ~ 1

Author(s):

Pegah Sarraf ◽

Mohammad Hossein Nekoofar ◽

Mohammad Saeed Sheykhrezae ◽

Paul M. H. Dummer

Keyword(s):

Root Canal ◽

Fracture Resistance ◽

Acrylic Resin ◽

Control Group ◽

Control Groups ◽

Cem Cement ◽

Filling Materials ◽

Gutta Percha ◽

Significant Difference ◽

And Control

Abstract Objective The aim of this study was to compare the fracture resistance of immature bovine roots when using ProRoot MTA, CEM Cement, and Biodentine as root filling materials. Materials and Methods An immature bovine tooth model was developed by removing the coronal and apical portions of 70 bovine incisors 8 mm above and 12 mm below the cementoenamel junction (CEJ). The specimens were then divided into five groups: ProRoot MTA, CEM Cement, Biodentine, gutta-percha/AH26 sealer, and control. All groups received a 5-mm apical plug with a temporary restorative material. Then, the remaining root canal space was filled with one of the afore-mentioned materials. After setting, the specimens were mounted in acrylic resin. Then, 3 mm coronal to the CEJ from the buccal side of the teeth and at a 135°angle to the long axis, the specimens were loaded until fracture. Results The specimens in the Biodentine (2196 N) and ProRoot MTA (2103 N) groups had significantly greater fracture resistance in comparison to the control group (p = 0.01). No significant difference was found between CEM Cement, gutta-percha and sealer AH26, and control groups. No significant differences occurred between the four experimental groups (p = 0.45). Conclusion Filling the root canal space with ProRoot MTA and Biodentine contributed to higher fracture resistance values.

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